Income Taxes - Income Tax Allocation (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Loss before income taxes		$ (7)	$ (1,400)	$ (28)	$ (1,861)
Income tax benefit/(provision)	[1],[2]	$ 36	$ (32)	$ 23	$ (79)
Effective tax rate		514.30%	(2.30%)	82.10%	(4.20%)

[1] (1) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.

[2] (2) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.